ML4435 Ver la hoja de datos (PDF) - Micro Linear Corporation
Número de pieza
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Fabricante
ML4435 Datasheet PDF : 14 Pages
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PRELIMINARY
ML4435
FUNCTIONAL DESCRIPTION
COAST
When CVCO (pin 20) is pulled below 1.5V the output
drivers LA, LB, LC and HA, HB, and HC are turned off.
The COAST function shuts all power off from the motor
allowing it to coast to a stop. The COAST function in (pin
20) is configured as shown in Figure 13 and can be driven
by a switch to ground or open collector to ground also
shown in Figure 13.
3. 5V
2V
CVCO
20
+
COAST
COMP
.5V
–
UNDER VOLTAGE PROTECTION
Undervoltage protection is used to protect the 3 phase
bridge power stage from a low VCC condition. Undervolt-
age is triggered at VCC of 9.2V or under. Undervoltage
also turns off all output drivers LA, LB, LC, HA, HB, and
HC. The comparator that triggers undervoltage protection
has 500mV of hystersis.
INTERFACING THE OUTPUT DRIVERS TO THE 3
PHASE BRIDGE POWER STAGE
The most flexible configuration is to use high side drivers
to control N-Channel MOSFETs (or IGBTs) allowing appli-
cations from less than 12V up to 170V. Figure 14a shows
the ML4435 and all the support circuitry in a typical
application. Figure 14b shows a power stage using the
IR2118 high side drivers from International Rectifier and
high voltage MOSFETs.
Figure 13. Coast Control
TP 0 ISENSE
TP 3 TACH
R3
k
C3 2200 F
C5 0.33 F
C4
0F
R4 20k
R6
0k
TP SPEED SET
R
k
R2
00k
R
90.9k
2V
C2
0. F
ML4435
ISENSE
CVCO 20
2 TACH
I LIMIT 9
3 S COMP
S FB
4 RVCO
ND
5 S SET
FB C 6
6 RT
FB B 5
HA
4
FB A
HB
9 HC
3
LC
2
LB
0 VCC
LA
R
R9
R2
k
k
k
TP 5 LIMIT
RUN
SW
N.C.
SW4PDT
N.C.
C0
00 F
R0
k
N.C.
COAST
TP 2
S FB
C
.033 F
R5
R6
0k
C9
.0 F
C
.F
200k
C
4F
Figure 14a. ML4435 Typical Application
10
PRELIMINARY DATASHEET May, 2000
P
N.C.
2
N.C.
3
4
5
6
9
0
2
3
4
5
6
2V
9
20
N.C.
2
22
N.C.
23
24
N.C.
25
26
N.C.
IDC 26
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